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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2011 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.util.concurrent;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static java.util.concurrent.TimeUnit.NANOSECONDS;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.google.common.annotations.Beta;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.base.Preconditions;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.concurrent.BlockingQueue;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.concurrent.CountDownLatch;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.concurrent.ExecutionException;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.concurrent.Future;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.concurrent.TimeUnit;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.concurrent.TimeoutException;<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>/**<a name="line.31"></a>
<span class="sourceLineNo">032</span> * Utilities for treating interruptible operations as uninterruptible.<a name="line.32"></a>
<span class="sourceLineNo">033</span> * In all cases, if a thread is interrupted during such a call, the call<a name="line.33"></a>
<span class="sourceLineNo">034</span> * continues to block until the result is available or the timeout elapses,<a name="line.34"></a>
<span class="sourceLineNo">035</span> * and only then re-interrupts the thread.<a name="line.35"></a>
<span class="sourceLineNo">036</span> *<a name="line.36"></a>
<span class="sourceLineNo">037</span> * @author Anthony Zana<a name="line.37"></a>
<span class="sourceLineNo">038</span> * @since 10.0<a name="line.38"></a>
<span class="sourceLineNo">039</span> */<a name="line.39"></a>
<span class="sourceLineNo">040</span>@Beta<a name="line.40"></a>
<span class="sourceLineNo">041</span>public final class Uninterruptibles {<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span>  // Implementation Note: As of 3-7-11, the logic for each blocking/timeout<a name="line.43"></a>
<span class="sourceLineNo">044</span>  // methods is identical, save for method being invoked.<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>  /**<a name="line.46"></a>
<span class="sourceLineNo">047</span>   * Invokes {@code latch.}{@link CountDownLatch#await() await()}<a name="line.47"></a>
<span class="sourceLineNo">048</span>   * uninterruptibly.<a name="line.48"></a>
<span class="sourceLineNo">049</span>   */<a name="line.49"></a>
<span class="sourceLineNo">050</span>  public static void awaitUninterruptibly(CountDownLatch latch) {<a name="line.50"></a>
<span class="sourceLineNo">051</span>    boolean interrupted = false;<a name="line.51"></a>
<span class="sourceLineNo">052</span>    try {<a name="line.52"></a>
<span class="sourceLineNo">053</span>      while (true) {<a name="line.53"></a>
<span class="sourceLineNo">054</span>        try {<a name="line.54"></a>
<span class="sourceLineNo">055</span>          latch.await();<a name="line.55"></a>
<span class="sourceLineNo">056</span>          return;<a name="line.56"></a>
<span class="sourceLineNo">057</span>        } catch (InterruptedException e) {<a name="line.57"></a>
<span class="sourceLineNo">058</span>          interrupted = true;<a name="line.58"></a>
<span class="sourceLineNo">059</span>        }<a name="line.59"></a>
<span class="sourceLineNo">060</span>      }<a name="line.60"></a>
<span class="sourceLineNo">061</span>    } finally {<a name="line.61"></a>
<span class="sourceLineNo">062</span>      if (interrupted) {<a name="line.62"></a>
<span class="sourceLineNo">063</span>        Thread.currentThread().interrupt();<a name="line.63"></a>
<span class="sourceLineNo">064</span>      }<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span>  }<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span>  /**<a name="line.68"></a>
<span class="sourceLineNo">069</span>   * Invokes<a name="line.69"></a>
<span class="sourceLineNo">070</span>   * {@code latch.}{@link CountDownLatch#await(long, TimeUnit)<a name="line.70"></a>
<span class="sourceLineNo">071</span>   * await(timeout, unit)} uninterruptibly.<a name="line.71"></a>
<span class="sourceLineNo">072</span>   */<a name="line.72"></a>
<span class="sourceLineNo">073</span>  public static boolean awaitUninterruptibly(CountDownLatch latch,<a name="line.73"></a>
<span class="sourceLineNo">074</span>      long timeout, TimeUnit unit) {<a name="line.74"></a>
<span class="sourceLineNo">075</span>    boolean interrupted = false;<a name="line.75"></a>
<span class="sourceLineNo">076</span>    try {<a name="line.76"></a>
<span class="sourceLineNo">077</span>      long remainingNanos = unit.toNanos(timeout);<a name="line.77"></a>
<span class="sourceLineNo">078</span>      long end = System.nanoTime() + remainingNanos;<a name="line.78"></a>
<span class="sourceLineNo">079</span><a name="line.79"></a>
<span class="sourceLineNo">080</span>      while (true) {<a name="line.80"></a>
<span class="sourceLineNo">081</span>        try {<a name="line.81"></a>
<span class="sourceLineNo">082</span>          // CountDownLatch treats negative timeouts just like zero.<a name="line.82"></a>
<span class="sourceLineNo">083</span>          return latch.await(remainingNanos, NANOSECONDS);<a name="line.83"></a>
<span class="sourceLineNo">084</span>        } catch (InterruptedException e) {<a name="line.84"></a>
<span class="sourceLineNo">085</span>          interrupted = true;<a name="line.85"></a>
<span class="sourceLineNo">086</span>          remainingNanos = end - System.nanoTime();<a name="line.86"></a>
<span class="sourceLineNo">087</span>        }<a name="line.87"></a>
<span class="sourceLineNo">088</span>      }<a name="line.88"></a>
<span class="sourceLineNo">089</span>    } finally {<a name="line.89"></a>
<span class="sourceLineNo">090</span>      if (interrupted) {<a name="line.90"></a>
<span class="sourceLineNo">091</span>        Thread.currentThread().interrupt();<a name="line.91"></a>
<span class="sourceLineNo">092</span>      }<a name="line.92"></a>
<span class="sourceLineNo">093</span>    }<a name="line.93"></a>
<span class="sourceLineNo">094</span>  }<a name="line.94"></a>
<span class="sourceLineNo">095</span><a name="line.95"></a>
<span class="sourceLineNo">096</span>  /**<a name="line.96"></a>
<span class="sourceLineNo">097</span>   * Invokes {@code toJoin.}{@link Thread#join() join()} uninterruptibly.<a name="line.97"></a>
<span class="sourceLineNo">098</span>   */<a name="line.98"></a>
<span class="sourceLineNo">099</span>  public static void joinUninterruptibly(Thread toJoin) {<a name="line.99"></a>
<span class="sourceLineNo">100</span>    boolean interrupted = false;<a name="line.100"></a>
<span class="sourceLineNo">101</span>    try {<a name="line.101"></a>
<span class="sourceLineNo">102</span>      while (true) {<a name="line.102"></a>
<span class="sourceLineNo">103</span>        try {<a name="line.103"></a>
<span class="sourceLineNo">104</span>          toJoin.join();<a name="line.104"></a>
<span class="sourceLineNo">105</span>          return;<a name="line.105"></a>
<span class="sourceLineNo">106</span>        } catch (InterruptedException e) {<a name="line.106"></a>
<span class="sourceLineNo">107</span>          interrupted = true;<a name="line.107"></a>
<span class="sourceLineNo">108</span>        }<a name="line.108"></a>
<span class="sourceLineNo">109</span>      }<a name="line.109"></a>
<span class="sourceLineNo">110</span>    } finally {<a name="line.110"></a>
<span class="sourceLineNo">111</span>      if (interrupted) {<a name="line.111"></a>
<span class="sourceLineNo">112</span>        Thread.currentThread().interrupt();<a name="line.112"></a>
<span class="sourceLineNo">113</span>      }<a name="line.113"></a>
<span class="sourceLineNo">114</span>    }<a name="line.114"></a>
<span class="sourceLineNo">115</span>  }<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>
<span class="sourceLineNo">117</span>  /**<a name="line.117"></a>
<span class="sourceLineNo">118</span>   * Invokes {@code future.}{@link Future#get() get()} uninterruptibly.<a name="line.118"></a>
<span class="sourceLineNo">119</span>   * To get uninterruptibility and remove checked exceptions, see<a name="line.119"></a>
<span class="sourceLineNo">120</span>   * {@link Futures#getUnchecked}.<a name="line.120"></a>
<span class="sourceLineNo">121</span>   *<a name="line.121"></a>
<span class="sourceLineNo">122</span>   * &lt;p&gt;If instead, you wish to treat {@link InterruptedException} uniformly<a name="line.122"></a>
<span class="sourceLineNo">123</span>   * with other exceptions, see {@link Futures#get(Future, Class) Futures.get}<a name="line.123"></a>
<span class="sourceLineNo">124</span>   * or {@link Futures#makeChecked}.<a name="line.124"></a>
<span class="sourceLineNo">125</span>   *<a name="line.125"></a>
<span class="sourceLineNo">126</span>   * @throws ExecutionException if the computation threw an exception<a name="line.126"></a>
<span class="sourceLineNo">127</span>   * @throws CancellationException if the computation was cancelled<a name="line.127"></a>
<span class="sourceLineNo">128</span>   */<a name="line.128"></a>
<span class="sourceLineNo">129</span>  public static &lt;V&gt; V getUninterruptibly(Future&lt;V&gt; future)<a name="line.129"></a>
<span class="sourceLineNo">130</span>      throws ExecutionException {<a name="line.130"></a>
<span class="sourceLineNo">131</span>    boolean interrupted = false;<a name="line.131"></a>
<span class="sourceLineNo">132</span>    try {<a name="line.132"></a>
<span class="sourceLineNo">133</span>      while (true) {<a name="line.133"></a>
<span class="sourceLineNo">134</span>        try {<a name="line.134"></a>
<span class="sourceLineNo">135</span>          return future.get();<a name="line.135"></a>
<span class="sourceLineNo">136</span>        } catch (InterruptedException e) {<a name="line.136"></a>
<span class="sourceLineNo">137</span>          interrupted = true;<a name="line.137"></a>
<span class="sourceLineNo">138</span>        }<a name="line.138"></a>
<span class="sourceLineNo">139</span>      }<a name="line.139"></a>
<span class="sourceLineNo">140</span>    } finally {<a name="line.140"></a>
<span class="sourceLineNo">141</span>      if (interrupted) {<a name="line.141"></a>
<span class="sourceLineNo">142</span>        Thread.currentThread().interrupt();<a name="line.142"></a>
<span class="sourceLineNo">143</span>      }<a name="line.143"></a>
<span class="sourceLineNo">144</span>    }<a name="line.144"></a>
<span class="sourceLineNo">145</span>  }<a name="line.145"></a>
<span class="sourceLineNo">146</span><a name="line.146"></a>
<span class="sourceLineNo">147</span>  /**<a name="line.147"></a>
<span class="sourceLineNo">148</span>   * Invokes<a name="line.148"></a>
<span class="sourceLineNo">149</span>   * {@code future.}{@link Future#get(long, TimeUnit) get(timeout, unit)}<a name="line.149"></a>
<span class="sourceLineNo">150</span>   * uninterruptibly.<a name="line.150"></a>
<span class="sourceLineNo">151</span>   *<a name="line.151"></a>
<span class="sourceLineNo">152</span>   * &lt;p&gt;If instead, you wish to treat {@link InterruptedException} uniformly<a name="line.152"></a>
<span class="sourceLineNo">153</span>   * with other exceptions, see {@link Futures#get(Future, Class) Futures.get}<a name="line.153"></a>
<span class="sourceLineNo">154</span>   * or {@link Futures#makeChecked}.<a name="line.154"></a>
<span class="sourceLineNo">155</span>   *<a name="line.155"></a>
<span class="sourceLineNo">156</span>   * @throws ExecutionException if the computation threw an exception<a name="line.156"></a>
<span class="sourceLineNo">157</span>   * @throws CancellationException if the computation was cancelled<a name="line.157"></a>
<span class="sourceLineNo">158</span>   * @throws TimeoutException if the wait timed out<a name="line.158"></a>
<span class="sourceLineNo">159</span>   */<a name="line.159"></a>
<span class="sourceLineNo">160</span>  public static &lt;V&gt; V getUninterruptibly(<a name="line.160"></a>
<span class="sourceLineNo">161</span>      Future&lt;V&gt; future, long timeout,  TimeUnit unit)<a name="line.161"></a>
<span class="sourceLineNo">162</span>          throws ExecutionException, TimeoutException {<a name="line.162"></a>
<span class="sourceLineNo">163</span>    boolean interrupted = false;<a name="line.163"></a>
<span class="sourceLineNo">164</span>    try {<a name="line.164"></a>
<span class="sourceLineNo">165</span>      long remainingNanos = unit.toNanos(timeout);<a name="line.165"></a>
<span class="sourceLineNo">166</span>      long end = System.nanoTime() + remainingNanos;<a name="line.166"></a>
<span class="sourceLineNo">167</span><a name="line.167"></a>
<span class="sourceLineNo">168</span>      while (true) {<a name="line.168"></a>
<span class="sourceLineNo">169</span>        try {<a name="line.169"></a>
<span class="sourceLineNo">170</span>          // Future treats negative timeouts just like zero.<a name="line.170"></a>
<span class="sourceLineNo">171</span>          return future.get(remainingNanos, NANOSECONDS);<a name="line.171"></a>
<span class="sourceLineNo">172</span>        } catch (InterruptedException e) {<a name="line.172"></a>
<span class="sourceLineNo">173</span>          interrupted = true;<a name="line.173"></a>
<span class="sourceLineNo">174</span>          remainingNanos = end - System.nanoTime();<a name="line.174"></a>
<span class="sourceLineNo">175</span>        }<a name="line.175"></a>
<span class="sourceLineNo">176</span>      }<a name="line.176"></a>
<span class="sourceLineNo">177</span>    } finally {<a name="line.177"></a>
<span class="sourceLineNo">178</span>      if (interrupted) {<a name="line.178"></a>
<span class="sourceLineNo">179</span>        Thread.currentThread().interrupt();<a name="line.179"></a>
<span class="sourceLineNo">180</span>      }<a name="line.180"></a>
<span class="sourceLineNo">181</span>    }<a name="line.181"></a>
<span class="sourceLineNo">182</span>  }<a name="line.182"></a>
<span class="sourceLineNo">183</span><a name="line.183"></a>
<span class="sourceLineNo">184</span>  /**<a name="line.184"></a>
<span class="sourceLineNo">185</span>   * Invokes<a name="line.185"></a>
<span class="sourceLineNo">186</span>   * {@code unit.}{@link TimeUnit#timedJoin(Thread, long)<a name="line.186"></a>
<span class="sourceLineNo">187</span>   * timedJoin(toJoin, timeout)} uninterruptibly.<a name="line.187"></a>
<span class="sourceLineNo">188</span>   */<a name="line.188"></a>
<span class="sourceLineNo">189</span>  public static void joinUninterruptibly(Thread toJoin,<a name="line.189"></a>
<span class="sourceLineNo">190</span>      long timeout, TimeUnit unit) {<a name="line.190"></a>
<span class="sourceLineNo">191</span>    Preconditions.checkNotNull(toJoin);<a name="line.191"></a>
<span class="sourceLineNo">192</span>    boolean interrupted = false;<a name="line.192"></a>
<span class="sourceLineNo">193</span>    try {<a name="line.193"></a>
<span class="sourceLineNo">194</span>      long remainingNanos = unit.toNanos(timeout);<a name="line.194"></a>
<span class="sourceLineNo">195</span>      long end = System.nanoTime() + remainingNanos;<a name="line.195"></a>
<span class="sourceLineNo">196</span>      while (true) {<a name="line.196"></a>
<span class="sourceLineNo">197</span>        try {<a name="line.197"></a>
<span class="sourceLineNo">198</span>          // TimeUnit.timedJoin() treats negative timeouts just like zero.<a name="line.198"></a>
<span class="sourceLineNo">199</span>          NANOSECONDS.timedJoin(toJoin, remainingNanos);<a name="line.199"></a>
<span class="sourceLineNo">200</span>          return;<a name="line.200"></a>
<span class="sourceLineNo">201</span>        } catch (InterruptedException e) {<a name="line.201"></a>
<span class="sourceLineNo">202</span>          interrupted = true;<a name="line.202"></a>
<span class="sourceLineNo">203</span>          remainingNanos = end - System.nanoTime();<a name="line.203"></a>
<span class="sourceLineNo">204</span>        }<a name="line.204"></a>
<span class="sourceLineNo">205</span>      }<a name="line.205"></a>
<span class="sourceLineNo">206</span>    } finally {<a name="line.206"></a>
<span class="sourceLineNo">207</span>      if (interrupted) {<a name="line.207"></a>
<span class="sourceLineNo">208</span>        Thread.currentThread().interrupt();<a name="line.208"></a>
<span class="sourceLineNo">209</span>      }<a name="line.209"></a>
<span class="sourceLineNo">210</span>    }<a name="line.210"></a>
<span class="sourceLineNo">211</span>  }<a name="line.211"></a>
<span class="sourceLineNo">212</span><a name="line.212"></a>
<span class="sourceLineNo">213</span>  /**<a name="line.213"></a>
<span class="sourceLineNo">214</span>   * Invokes {@code queue.}{@link BlockingQueue#take() take()} uninterruptibly.<a name="line.214"></a>
<span class="sourceLineNo">215</span>   */<a name="line.215"></a>
<span class="sourceLineNo">216</span>  public static &lt;E&gt; E takeUninterruptibly(BlockingQueue&lt;E&gt; queue) {<a name="line.216"></a>
<span class="sourceLineNo">217</span>    boolean interrupted = false;<a name="line.217"></a>
<span class="sourceLineNo">218</span>    try {<a name="line.218"></a>
<span class="sourceLineNo">219</span>      while (true) {<a name="line.219"></a>
<span class="sourceLineNo">220</span>        try {<a name="line.220"></a>
<span class="sourceLineNo">221</span>          return queue.take();<a name="line.221"></a>
<span class="sourceLineNo">222</span>        } catch (InterruptedException e) {<a name="line.222"></a>
<span class="sourceLineNo">223</span>          interrupted = true;<a name="line.223"></a>
<span class="sourceLineNo">224</span>        }<a name="line.224"></a>
<span class="sourceLineNo">225</span>      }<a name="line.225"></a>
<span class="sourceLineNo">226</span>    } finally {<a name="line.226"></a>
<span class="sourceLineNo">227</span>      if (interrupted) {<a name="line.227"></a>
<span class="sourceLineNo">228</span>        Thread.currentThread().interrupt();<a name="line.228"></a>
<span class="sourceLineNo">229</span>      }<a name="line.229"></a>
<span class="sourceLineNo">230</span>    }<a name="line.230"></a>
<span class="sourceLineNo">231</span>  }<a name="line.231"></a>
<span class="sourceLineNo">232</span><a name="line.232"></a>
<span class="sourceLineNo">233</span>  /**<a name="line.233"></a>
<span class="sourceLineNo">234</span>   * Invokes {@code queue.}{@link BlockingQueue#put(Object) put(element)}<a name="line.234"></a>
<span class="sourceLineNo">235</span>   * uninterruptibly.<a name="line.235"></a>
<span class="sourceLineNo">236</span>   *<a name="line.236"></a>
<span class="sourceLineNo">237</span>   * @throws ClassCastException if the class of the specified element prevents<a name="line.237"></a>
<span class="sourceLineNo">238</span>   *     it from being added to the given queue<a name="line.238"></a>
<span class="sourceLineNo">239</span>   * @throws IllegalArgumentException if some property of the specified element<a name="line.239"></a>
<span class="sourceLineNo">240</span>   *     prevents it from being added to the given queue<a name="line.240"></a>
<span class="sourceLineNo">241</span>   */<a name="line.241"></a>
<span class="sourceLineNo">242</span>  public static &lt;E&gt; void putUninterruptibly(BlockingQueue&lt;E&gt; queue, E element) {<a name="line.242"></a>
<span class="sourceLineNo">243</span>    boolean interrupted = false;<a name="line.243"></a>
<span class="sourceLineNo">244</span>    try {<a name="line.244"></a>
<span class="sourceLineNo">245</span>      while (true) {<a name="line.245"></a>
<span class="sourceLineNo">246</span>        try {<a name="line.246"></a>
<span class="sourceLineNo">247</span>          queue.put(element);<a name="line.247"></a>
<span class="sourceLineNo">248</span>          return;<a name="line.248"></a>
<span class="sourceLineNo">249</span>        } catch (InterruptedException e) {<a name="line.249"></a>
<span class="sourceLineNo">250</span>          interrupted = true;<a name="line.250"></a>
<span class="sourceLineNo">251</span>        }<a name="line.251"></a>
<span class="sourceLineNo">252</span>      }<a name="line.252"></a>
<span class="sourceLineNo">253</span>    } finally {<a name="line.253"></a>
<span class="sourceLineNo">254</span>      if (interrupted) {<a name="line.254"></a>
<span class="sourceLineNo">255</span>        Thread.currentThread().interrupt();<a name="line.255"></a>
<span class="sourceLineNo">256</span>      }<a name="line.256"></a>
<span class="sourceLineNo">257</span>    }<a name="line.257"></a>
<span class="sourceLineNo">258</span>  }<a name="line.258"></a>
<span class="sourceLineNo">259</span><a name="line.259"></a>
<span class="sourceLineNo">260</span>  // TODO(user): Support Sleeper somehow (wrapper or interface method)?<a name="line.260"></a>
<span class="sourceLineNo">261</span>  /**<a name="line.261"></a>
<span class="sourceLineNo">262</span>   * Invokes {@code unit.}{@link TimeUnit#sleep(long) sleep(sleepFor)}<a name="line.262"></a>
<span class="sourceLineNo">263</span>   * uninterruptibly.<a name="line.263"></a>
<span class="sourceLineNo">264</span>   */<a name="line.264"></a>
<span class="sourceLineNo">265</span>  public static void sleepUninterruptibly(long sleepFor, TimeUnit unit) {<a name="line.265"></a>
<span class="sourceLineNo">266</span>    boolean interrupted = false;<a name="line.266"></a>
<span class="sourceLineNo">267</span>    try {<a name="line.267"></a>
<span class="sourceLineNo">268</span>      long remainingNanos = unit.toNanos(sleepFor);<a name="line.268"></a>
<span class="sourceLineNo">269</span>      long end = System.nanoTime() + remainingNanos;<a name="line.269"></a>
<span class="sourceLineNo">270</span>      while (true) {<a name="line.270"></a>
<span class="sourceLineNo">271</span>        try {<a name="line.271"></a>
<span class="sourceLineNo">272</span>          // TimeUnit.sleep() treats negative timeouts just like zero.<a name="line.272"></a>
<span class="sourceLineNo">273</span>          NANOSECONDS.sleep(remainingNanos);<a name="line.273"></a>
<span class="sourceLineNo">274</span>          return;<a name="line.274"></a>
<span class="sourceLineNo">275</span>        } catch (InterruptedException e) {<a name="line.275"></a>
<span class="sourceLineNo">276</span>          interrupted = true;<a name="line.276"></a>
<span class="sourceLineNo">277</span>          remainingNanos = end - System.nanoTime();<a name="line.277"></a>
<span class="sourceLineNo">278</span>        }<a name="line.278"></a>
<span class="sourceLineNo">279</span>      }<a name="line.279"></a>
<span class="sourceLineNo">280</span>    } finally {<a name="line.280"></a>
<span class="sourceLineNo">281</span>      if (interrupted) {<a name="line.281"></a>
<span class="sourceLineNo">282</span>        Thread.currentThread().interrupt();<a name="line.282"></a>
<span class="sourceLineNo">283</span>      }<a name="line.283"></a>
<span class="sourceLineNo">284</span>    }<a name="line.284"></a>
<span class="sourceLineNo">285</span>  }<a name="line.285"></a>
<span class="sourceLineNo">286</span><a name="line.286"></a>
<span class="sourceLineNo">287</span>  // TODO(user): Add support for waitUninterruptibly.<a name="line.287"></a>
<span class="sourceLineNo">288</span><a name="line.288"></a>
<span class="sourceLineNo">289</span>  private Uninterruptibles() {}<a name="line.289"></a>
<span class="sourceLineNo">290</span>}<a name="line.290"></a>




























































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